I've got a couple of folders (Zeiss Ikon Nettar, Voigtlander Vito II) that I'd like to try flash bulbs with. I know relatively little about them - the closest I've got previously was using flash cubes and flip flash in the 80s/90s.

I presume I need a 'M' type unit and appropriate bulbs, any pointers for what I should be looking out for ?

I have seen them, from what I understand they're for cavers who need the power from a bulb flash ? That they don't list prices on their website indicates that they're probably going to be expensive items for a niche market.

They produce a "softer" light output with longer duration due to the combustion characteristics. As the material ignites, the "fire" starts slowly at first, producing low light output, increasing rapidly to a peak, then, declining as rapidly as it rose, to low and zero light output. The duration of the light produced can be from 4 milliseconds to 2 seconds, depending on the type and design of flash bulb. This can help to produce photos with more definition with the use of smaller grain film with smaller aperture settings.

I'd be careful buying a flashgun on eBay, altho' the Honeywells are not expensive. I looked at these just for fun. All of the units I saw were listed as untested or "as is." You are talking devices that are likely at least 40 years old, and they could be 50 or 60 years old. It's questionable whether the capacitors in them would still work. If you are into electronics tinkering. it might be possible to find a modern capacitor that would fit.

I'd be careful buying a flashgun on eBay, altho' the Honeywells are not expensive. I looked at these just for fun. All of the units I saw were listed as untested or "as is." You are talking devices that are likely at least 40 years old, and they could be 50 or 60 years old. It's questionable whether the capacitors in them would still work. If you are into electronics tinkering. it might be possible to find a modern capacitor that would fit.

Capacitors and funky old battery types. I have a flashbulb unit that uses a 22.5volt battery in an odd size that's long not available anymore.

You might end up revampng one of these old flashbulb units to modern capacitors and battery types. Requires some modest electical engineering skill, but nothing really difficult. Just need to know a few parameters and then search out components that can meet your needs and fit inside the old unit.

If you're not the tinkering/maker type, then I would recommend comprehensive research into the candidate flashbulb units available. Look for one that uses batteries you can purchase today, and the more recent the better.

Also remember that you may need to revitalize an old capacitor with repeated charge-discharge until it reaches its full "capacity". Sometimes the capacitor has simply given up, and a new one is the only solution (or seeking out another flashbulbunit).

I've got thousands of bulbs of many types. You set to M, usually 1/30th sec, test at 10ft with specific film ISO, and with a specific flashgun and reflector to compute your guide number. Then when you shoot at a specific distance you can compute your f/stop. f/stop = Gn/distance

__________________Never Seeing Nothing, published by inkBooks.Schmendrick, published by PoliwagBooks.

There are plenty of older flashguns that do not have a capacitor. They only require flashlight batteries and nothing else. If you get one that uses Edison screw base bulbs you can always get adapters to use smaller base bulbs. Why complicate things?

I'll occasionally use an old Brownie Hawkeye flash attachment with #5 bulbs; this would be for open flash so I don't have to synchronize with the camera.

Back about 20 years ago, I bought out the last of the bulbs from a few local old-timey camera shops; typically the boxes were in cartons covered with decades of dust! I usually got them for dirt cheap.

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